Oxygen-ion diffusion in a 110 K phase BiPbSrCaCuO superconductor

The oxygen-ion conductivity of a hot-pressed 110 K phase (2223) superconduc tor was determined by using an O-2,Pt/ZrO2/110 K phase/ZrO2/Pt,O-2 cell and impedance spectroscopy at temperature of 600 degrees-800 degrees C and oxy gen partial pressures (P-O2) of 0.21-0.001 atm (similar to 21-0.1 kPa), The oxygen-ion diffusivities were calculated via the Nerst-Einstein equation a nd were greater in air than at P-O2 = 0.001 atm, Decomposition of the 110 K phase at 800 degrees C and P-O2 = 0.001 atm increased the bulk diffusivity but had a lesser effect on the grain-boundary diffusivities. The activatio n energies for oxygen diffusion, at different P-O2 values, have been determ ined.